Quoting Rick Thomas (rbthomas@pobox.com):
> Well, in the mean-time, there's no way to test new d-i businesscard
> or netinst CDs beyond the disk partition step. Or, to put it more
> bluntly: Testing grinds to a halt until this is fixed.
>
> I haven't tried it on a DVD or CD install yet. Is it worth-while to
> do that? or will that need the upgraded busybox as well?
I'm afraid that anything that deals with downloading Packages files
from network mirrors will fail in some way. Probably only a DVD or CD
install without trying to use a network mirror will be fine.